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CircRNA profilings in gastric cancer

ABSTRACT: CircRNA profilings in gastric cancer

PROVIDER: PRJNA638934 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11999303_1.fastq.gz	Fastqsanger.gz
	SRR11999303_2.fastq.gz	Fastqsanger.gz
	SRR11999304_1.fastq.gz	Fastqsanger.gz
	SRR11999304_2.fastq.gz	Fastqsanger.gz
	SRR11999305_1.fastq.gz	Fastqsanger.gz

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Synthetic circular RNA functions as a miR-21 sponge to suppress gastric carcinoma cell proliferation

Project description:MicroRNA (miRNA) sponges containing miRNA complementary binding sites constitute a potentially useful strategy for miRNA-inhibition therapeutics in cancer patients. Recently, naturally occurring circular RNAs (circRNAs) have been revealed to function as efficient microRNA sponges. We hypothesized that synthetic circRNA sponges targeting oncomiRs could be constructed and used to achieve potentially therapeutic microRNA loss of function. In this study, linear RNA molecules containing five miR-21 binding sites were transcribed in vitro. After dephosphorylation by calf intestinal phosphatase and phosphorylation by T4 polynucleotide kinase, circRNA sponges were circularized using 5’-3’ end ligation by T4 RNA ligase 1. Synthetic circular sponge stability was assayed in the presence of RNase R or fetal bovine serum. Luciferase reporter and cell proliferation assays were performed to assess competitive inhibition of miR-21 activity by circRNA sponges in NCI-N87 gastric cancer cells. Tandem Mass Tag (TMT) labeling proteomics analysis and Western blotting were performed to delineate effects of circRNA sponges on miR-21 downstream targeted proteins. Our experiments revealed that artificial circRNA sponges can be synthesized using enzymatic ligation. These synthetic circRNA sponges are more resistant than their linear RNA counterparts to nuclease degradation in vitro. They effectively suppress the activity of miR-21 on its downstream protein targets, including the important cancer protein DAXX. Finally, they also inhibit gastric cancer cell proliferation. Our results suggest that synthetic circRNA sponges represent a rapid, effective, convenient strategy to achieve loss of miRNA function in vitro, with potential future therapeutic application in vivo.

2018-10-22 | PXD008584 | Pride

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